How to set Oblivious HTTP (OHTTP, former name: Oblivious DNS over HTTPS, ODoH) in about:config?

[tom25519]

I try to set OHTTP in Firefox, yesterday I managed to let it work in sandboxie by chance, but after I clear the sandbox, it couldn't reproduce because I forget the specific steps. Have someone know about this?

[siffemcon]

It is still work in progress (https://bugzilla.mozilla.org/show_bug.cgi?id=1795940) and hasn't been officially released yet. In about:config, there are several entries if you search for ohttp.